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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 0 |
| 4 | 2 |
| 5 | 2 |
| 6 | 7 |
| 7 | 12 |
| 8 | 32 |
| 9 | 67 |
| 10 | 169 |
| 11 | 390 |
| 12 | 985 |
| 13 | 2412 |
| 14 | 6209 |
| 15 | 15871 |
| 16 | 41867 |
| 17 | 110797 |
| 18 | 299836 |
| 19 | 817612 |
| 20 | 2268640 |
| 21 | 6354409 |
| 22 | 18058764 |
| 23 | 51838340 |
| 24 | 150704087 |
| 25 | 442550971 |
| 26 | 1314527780 |
| 27 | 3943140077 |
| 28 | 11953192954 |
| 29 | 36580095663 |
| 30 | 113048257691 |
| 31 | 352564213025 |
| 32 | 1109727658303 |
[1,0,2,2,7,12,32,67,169,390,985,2412,6209,15871, 41867,110797,299836,817612,2268640,6354409, 18058764,51838340,150704087,442550971,1314527780, 3943140077,11953192954,36580095663,113048257691, 352564213025,1109727658303] |